Heat diffuser



FIG. 1 is a top, perspective view of the heat diffuser of the present invention;

FIG. 2 is a front view of the heat diffuser shown in FIG. 1;

FIG. 3 is top view of the heat diffuser shown in FIG. 1;

FIG. 4 is a right-side view of the heat diffuser shown in FIG. 1; and,

FIG. 5 is a bottom view of the heat diffuser shown in FIG. 1. 

CLAIM The ornamental design for a heat diffuser, as shown and described. 